SASS ripple effects Android

_mixins.scss

//
// "watter" effects for buttons
//
@mixin ripple {

  position: relative;
  overflow: hidden;
  transform: translate3d(0, 0, 0);

  &:after {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, #000 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform .5s, opacity 1s;
  }

  &:active {
    &:after {
      transform: scale(0, 0);
      opacity: .2;
      transition: 0s;
    }
  }

}